Best Online Slot Sites in the UK

Although many people still associate casinos with traditional games such as roulette, blackjack and poker, in the online gaming world slots account for about 90% of the offering and frequently even more.

Regardless of how simple or complex the gameplay may be, no skills are required to spin the reels.

Diversity in terms of themes, the set-up, mechanism and win potential is already impressive and will doubtlessly keep increasing; there are really no limits except for the developers’ imagination.

However, not all slot sites allow us to enjoy the full potential of such diversified offerings, and some of those that do, fail to deliver in other areas.

The best ones outperform the competition across the board, providing everything a slot enthusiast needs to enjoy the experience from beginning to end.

Honestly, there’s probably a few hundred online casinos that would qualify as pretty great slot sites.

Vice versa, there are a few hundred that are absolute garbage.

We have compiled two separate lists to cover both below. All of the recommended sites are licensed by the UKGC.

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Our Favourites for Slots This Month

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Casino Brand
Deposit Bonus & Details
What We Like
Visit Website
Wager Free Spins 50
T&C Apply
No Wagering On Any Rewards - Ever
3,000+ Games Under One Account - All Top Tier Suppliers On Board
UKGC & MGA Licensed - Secure & Fast Paying
* New players only. Min deposit is £10. 50 Free Spins on Book of Dead. Spin Value: £0.10. After your first deposit, you may claim your 30 Extra Free Spins by visiting the Kicker Section. No min withdrawal. Play responsibly. Full T&C's Apply. 18+
T&C Apply
10 No Deposit Free Spins on Book Of Dead
Powered by White Hat Gaming - Tons of Games
30+ Game Suppliers
* 18+. New players only. Min deposit £20. Bonus spins are valid on Book of Dead only. Bonus funds are 100% up to £300 and separate to Cash funds. 35x bonus wagering requirements apply. Only bonus funds count towards wagering requirements. £5 max. bet with bonus. Bonus funds must be used within 30 days, otherwise any unused shall be removed. Terms Apply.
T&C Apply
PayPal Deposits and Withdrawals
Powered by White Hat Gaming - An Epic Amount of Games
MGA & UKGC Licensed - Secure Experience
* 18+. New players only. Minimum deposit of £10. Bonus spins are valid on Fruit Shop only and subject to 35x wagering, and must be used within 10 days, otherwise any unused bonus spins shall be removed. Bonus funds are 100% up to £100 and separate to Cash funds. 35x bonus wagering requirements and only bonus funds count towards wagering contribution. £5 max bet with bonus. Bonus must be used within 30 days otherwise any unused bonus shall be removed. Terms Apply.
T&C Apply
£1,000 Welcome Package Over 3 Deposits
White Hat Gaming Brand - Great Ranges of Suppliers
PayPal Accepted
* 18+. New players only. Min. deposit £10. Bonus: 1st deposit 100% up to £300 + 30 bonus spins (Reactoonz), 2nd deposit 50% up to £500 + 50 bonus spins (Book of Dead), 3rd deposit 25% up to £200 + 20 bonus spins (Legacy of Egypt). Spins on specified games only. Bonus money is separate to Cash funds & subject to 35x wagering requirement. £5 bonus max. bet. Bonus must be used within 30 days, spins within 10 days, otherwise any unused will be removed. Only bonus funds contribute towards wagering requirements. Terms Apply.
T&C Apply
Pay By Phone Blll & PayPal Deposits
Evolution Gaming Live Casino
Powered by White Hat Gaming - Tons of Games
* 18+. New players only. Min deposit £20. Bonus spins valid on Starburst only. Bonus funds are 100% up to £222 and separate to Cash funds. 35x (bonus only) wagering requirements. Only bonus funds count towards wagering requirements. £5 bonus max bet. Bonus funds must be used within 30 days, spins within 10 days, otherwise any unused shall be removed. Terms Apply.
T&C Apply
21 No Deposit Free Spins on Book Of Dead
Powered by White Hat Gaming - Tons of Games
Evolution Gaming Live Casino
* New players only. Min deposit £10. Bonus funds are 121% up to £300 and separate to Cash funds. 35x bonus wagering requirements apply. Only bonus funds count towards wagering requirements. £5 max. bet with bonus. Bonus funds must be used within 30 days, otherwise any unused shall be removed. Terms Apply.
*18+ T&C's apply to all bonus offers. Please gamble responsibly.

Traits of the Best Slot Sites 

Not that long ago, the majority of online casinos were offering only a few hundred titles from a single provider or at best several different suppliers. Once you’d move from a PC screen to a mobile device, this number would drop to about half.

Nowadays, operators partner up with dozens of software developers to create catalogues counting over 1,000 slots, most of which remain accessible on the move.

Some go an extra mile, not only in terms of the portfolio size but also other elements to make the gaming experience as enjoyable as possible.

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Trustworthy Operating License

Seeing that an online casino operates with an MGA or UKGC license immediately dispels any potential doubts about safety and fair play.

These two organizations are among the strictest regulators which do pretty much everything possible to make sure we play in a safe environment, get what we’ve paid for and receive prompt and efficient assistance when needed.

Curacao-licensed casinos don’t automatically deliver the same peace of mind owing to the fact the Curacao government seems to be a bit more interested in recruiting new licensees than protecting players’ interests.

However, the regulator’s doubtful reputation needn’t be the reason to avoid all slot sites which hold a Curacao license.

More than a few of them provide everything a slots fan is looking for, including top-notch security measures, fair and transparent terms, efficient support and prompt payouts.

Dozens of Software Providers

The more game providers, the bigger and better the choice of gaming options. Did you know that online casinos are nowadays able to source slots from more than 140 developers? Not many of them do, though.

Some don’t understand that, as much as we love titles produced by Microgaming, NetEnt, Red Tiger, Big Time Gaming, Playtech and other leading brands, we also want a chance to try something different.

Because they have to fight with well-established giants, smaller providers work extra hard to come up with innovative solutions and creative execution.

It may be technologically more challenging to host 4,000 slots than 1,000 games but the best online casinos demonstrate that it is possible to do so without making the website difficult to use, extending loading times or compromising on the quality of gameplay.

Rather than pick and choose, they’re happy to cooperate with pretty much any good provider willing to supply their products.

Transparent Return-to-Player Percentages

Most developers incorporate RTP info into their slots and some online casinos provide the same information for every game featured on their website.

Only a few go a step further by offering players to view actual RTPs during the certain time period and compare them to theoretical ones, and if you’re really lucky, you might come across a casino which will allow you to see your own payback percentages on games played.

Operators are well aware that fairness of spin/round outcome is one of the main client concerns. Simply stating that a game uses a Random Number Generator isn’t enough; players want a credible proof.

The best slot sites respond by being as transparent as possible when it comes to actual paybacks.

Slot Tournaments

Unlike players that favour table games such as Roulette or Blackjack, fans of slots have always been playing on their own, even when slot machines were only available at brick-and-mortar venues.

The virtual world, however, makes it super-easy to transform individual gameplay into a social experience with the competition element making it all the more exciting.

It’s no longer difficult to find online casinos able and willing to organize slot tournaments with tempting rewards.

Competitions take place every single day, with varying duration and different point collection mechanisms.

Some can be entered by paying a small fee and others are open to all registered members for free. Freerolls provide a risk-free opportunity to compete against others and win prizes paid in real money or bonus cash.

Paybacks via Promotions and Loyalty Programs

If your bet happens to lose, the money is gone forever – right? Not always! Some of the best slot sites are happy to share their profits via ongoing cashback bonuses and/or loyalty programs.

Cashbacks are usually offered on losses generated during a specific day, a week or a month.

The money may be returned as real, withdrawable cash or added to your bonus balance, waiting for the wagering requirements to be met.

If you register at a site that features a loyalty program, you are literally getting paid for every wager made.

The contribution rate of different games usually varies but every real money bet helps accumulate the minimum number of points required for redemption.

Low Bonus-Related Wagering Requirements

Casino bonuses are often promoted as “free money” but that doesn’t mean operators are ready to hand over cash without asking for anything in return.

It’s quite understandable that they want you to use the gift to play at their website rather than take their money and spend it elsewhere.

That’s why bonus funds, along with the resulting winnings, remain locked until the player meets wagering requirements by betting the credited bonus amount X number of times.

Very few online casinos are willing to offer a gift with no strings attached, but even being required to wager the bonus 20x or 30x gives you a fair chance to liberate the funds and have them moved from bonus to real money balance.

Rogue operators impose unrealistic targets with play-through requirements that are virtually impossible to meet.

Imagine depositing a £100 to receive a £100 bonus which is subject to 60x play-through applied to both bonuses and deposits. You’d have to wager 60x (£100+£100) = £12,000 (!) before the casino allows you to make a withdrawal.

What’s even worse is lack of transparency when it comes to promotional T&C so that you learn about predatory conditions only after the bonus was claimed and used to play.

Accessible and Efficient Customer Support

Anyone who has tried to contact support agents and failed, or had to wait for hours before getting a reply, or was unfortunate enough to communicate with an incompetent individual unable to answer even the simplest of questions, knows how much the quality of customer service matters.

Way too many gaming sites make their representatives available during limited hours, as if unaware that their clients tend to play at different times of day and night.

Many fail to properly train their staff and build their knowledge base, making them seem just as uninformed as the player looking for assistance.

Slot sites that truly care about the customer make sure there’s someone to talk to 24/7.

They establish multiple communication channels (Live Chat and email as the bare minimum), employ enough people to deal with large traffic and educate them to be able to communicate in a friendly yet professional manner.

They make sure their employees have all the information a player might be looking for and can promptly answer any question.

Fast and Hassle-Free Withdrawals

Everything works like a charm until it’s time for the casino to pay what’s due.

Multiple obstacles seem to appear out of nowhere, prolonging the wait and eventually making the player doubt they would ever get to enjoy the profit generated via one or more spin of the reels.

Regulatory obligations are frequently used to justify pending periods which last for days although we all know (thanks to fair operators that truly value their clients) it’s possible to finalize the validation process much, much faster.

There is no legitimate reason for an online casino to hold onto your cash for 72 hours. Those that do are usually trying to keep the money in house by giving you plenty of time to transfer funds back to your casino account.

At the same time, the best slot sites deal with the KYC procedure quickly and efficiently and process cash-out requests within an hour.

Some even incorporate withdrawal lock feature which makes it impossible to cancel the request and potentially gamble the money away instead of transferring it to your bank account.

Progressive Jackpots

You’d probably struggle to find a slots fan who has never dreamt about winning multiple millions while playing the likes of Mega Moolah or Mega Fortune.

Network progressive jackpots, fueled by every real money bet, can be truly massive and it often takes a single spin of the reels to join the millionaires club.

Chances of winning may be on par with odds of claiming a lottery jackpot but we do know for sure that progressive jackpot slots do pay; all it takes is a bit of luck.

Developers keep finding new ways to offer mouth-watering rewards. Red Tiger Gaming recently came up with an innovative feature called Daily Drop Jackpots – progressives that are guaranteed to pay before a set time every single day.

These are available along with standard progressive jackpots that keep growing until someone collects, and ceiling jackpots with a guarantee to pay out before they hit a specified value.

Respect for Problem Gambling

Probably the most underestimated of all aspects of online slot sites – how they detect and treat potential problem gamblers.

Ideally, you join a site that lets you set sensible limits and will not try to lure you into playing for more than you can afford by some nasty marketing techniques.

Casumo is a great example of a socially responsible slot site. They often check up on those who deposit significantly more than usual by calling or sending an e-mail.

Compare this with some of the rogue casinos who will throw 500% match bonuses with no limits to unsuspecting players. Even though there’s no chance of withdrawing any potential winnings.

New Online Slots Site in 2020?

The online gaming industry is hugely competitive as is and still multiple new sites appear every single month.

Each newcomer has to fight for their share of the market, giving players a good enough reason to switch from their current favorite venues which at the same time do whatever is deemed necessary to prevent customer loss.

Advertising a massive welcome offer is no longer enough; newbies have to be creative and innovative in order to attract visitors and build a decent customer base.

One of the recently launched slot sites did so by eliminating the wagering requirement altogether. Some come up with unique loyalty programs which transform boring point-collection scheme into an exciting adventure.

Others remove minimum and/or maximum withdrawal limits or implement innovative concepts such as Pay N Play to enable super-fast and hassle-free registration, validation, deposits, and withdrawals.

Can you imagine a new feature sites that are yet to be launched in 2020 could offer to instantly drag you away from an online casino you’ve been entirely happy with? What would it take to convince you to hand your money to a complete stranger?

Would a promise of a daily balance boost that doesn’t require a deposit do the trick? How about a guarantee that you’ll get to withdraw a certain percentage of the winnings even if you fail to meet the wagering requirement attached to bonus funds that were used to play?

Perhaps one of the new sites, eager to succeed in this crowded market, decides to let each customer design their own promotional portfolio rather than pick from generic offers.

Possibilities are endless and we believe the industry employs plenty of highly creative individuals able to come up with unique concepts that would be beneficial for both the operator and their clients.

Not happy with the above selection of brands? For more great slot sites with a UK license you can check out a list of the latest casinos at All Slot Sites.

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No Deposit Free Spins

In order to claim a bonus, one usually has to make a certain minimum deposit. Consequently, a chance to play on the house without having to transfer any money sounds like a fantastic opportunity – right?

On one hand, no deposit Free Spins are a great offer since they give you a chance to win (eventually) withdrawable cash without having to take any risks.

On the other hand, moving your winnings from bonus to cash balance tends to be much more difficult owing to very high play-through requirements.

Then there’s the question of how valuable the gift truly is. Players are frequently being offered as few as 20 no-deposit Free Spins, each with a value as low as £0.20 – a present worth a total of only £4.

Every slot fan knows that it takes less than a minute to spin 20 times and the odds are those 20 rounds won’t make any positive impact on the bottom line.

In addition to the cost of not having to make a deposit in order to play for free (extremely high play-through), no-deposit Free Spins always come with a max win cap, and the cap is usually very low.

Such conditions and restrictions often make it more opportune to claim a standard deposit match rather than a no-deposit freebie.

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Superspins & Megaspins

Not all Free Spins are created equal. In addition to “standard” ones which are usually valued at $0.20, some online casinos also offer Megaspins and/or Superspins worth 2x, 5x or even 10x more.

Whether you’ll get one or other usually depends on the amount you’re willing to fund your account with and/or wager.

For example, a £50 deposit might earn you X Free Spins worth £0.20 each while players willing to transfer $100 receive Superspins with a value of $0.40/spin and those that deposit $200 or more get rewarded with Megaspins worth £1/spin.

The higher the value of the spin, the bigger is the resulting payout. Superspins and Mega spins are sometimes also offered to loyal members depending on their loyalty status.

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